Final answer:
The factor not evaluated when assessing the impact of vibration on employee health is employee age. The core aspects considered include vibration frequency, exposure duration, and vibration magnitude.
Step-by-step explanation:
When assessing the impact of vibration on employee health, employee age is not typically evaluated. The factors that are generally considered include vibration frequency, exposure duration, and vibration magnitude. These factors contribute directly to understanding the potential harms that may arise from exposure to vibration in the workplace environment. Evaluating these factors helps in the assessment of health risks and the development of workplace safety standards.